Version 3.0 – Version History

Versions 1.3 and 2.0 are maintained as archives.

For Version 3.0, the database management system has been completely replaced by
a relational database management system. This assures a high level of
consistency and integration of the data, as for example for the information on
the lines and levels of an atom.

Web Interface Improvements

A new version of the interface has been developed. The interface for the return
pages includes direct access to the bibliographic references by clicking on
links given in the tables. An advanced help system is provided with balloon
explanations of various symbols and quantities.

New graphical features include dynamic transition plots (Grotrian diagrams)
with ability to zoom into particular energy levels and their transitions and
online generated plots for Saha/Local Thermodynamic Equilibrium (LTE) plasma
emission spectra for arbitrary electron temperature and density. The Grotrian
diagrams interface requires a Java2 plugin (available at
java.sun.com) for the
user's browser.

Major Data Additions

The data tables have been expanded to include:

Spectrum lines and energy levels for xenon in all stages of
ionization Xe I-Xe LIV.

Spectrum lines and energy levels for rubidium in all stages of
ionization Rb I-Rb XXXVII.

Energy levels and lines for Hg I and Hg II.

New data for the energy levels and spectral lines of Zr III
and Zr IV.

New data for the lines and levels of
Ti III-Ti XXII, V IV-V XXIII,
Cr V-Cr XXIV, Mn VI-Mn XXV,
Fe VII-Fe XXVI, Co VIII-Co XXVII,
Ni IX-Ni XXVIII, Cu X-Cu XXIX, Kr V-Kr XXXVI,
Mo VI-Mo XLII.
This large body of data was taken from the compilation “Spectral Data for
Highly Ionized Atoms:
TI, V, Cr, Mn, Fe, Ni, Cu, Kr, and Mo,” by T. Shirai, J. Sugar,
A. Musgrove, and W.L. Wiese, J. Phys. Chem. Ref. Data,
Monograph 8 (2000). This volume provides data for the spectral lines of
these ions. Although the energy levels relevant to each line were given, there
was no separate table of energy levels in this volume. The energy values and
term identifications of the levels were taken from various NIST energy level
compilations, as already included in Version 2.0 of ASD. However,
Monograph 8 incorporated numerous modifications to the level data that had
taken place since the original NIST compilations.
A detailed description of corrections and changes
is available.

Data Corrections

An error that occurred in converting wavelengths in air longer than
20000 Å taken from the NIST68 compilation to wave numbers in
vacuum was corrected.

All questionable spectral lines (with wavelengths in parentheses
in ASD 2.0) are removed.

All terms split into levels (e.g., one term Mg XI 1s4f 3F
J=2-4 with energy [13379893] is now presented by three levels with
the same energy).

In all occurrences of the 3d7 shell, the incorrect term
2D2 replaced with the correct seniority term 2D3.

Ge
XXIV

He I

The energy levels are taken from
G.W.F. Drake and W.C. Martin, Can. J. Phys 76, 679-698 (1998).
Experimental values (from Table 8 of that paper) are used for 1s2s
3S1 and 1S0, 1s2p 3P2,1,0
and 1P1, 1s3s 1S0, 1s3p
3P2,1,0 and 1P1, 1s4s
3S1, and 1s5s 3S1. For
all other levels, the theoretical data (Table 6) are used. The
energies are rounded to 4 places.

Kr
XXXI

Energy 2002900 should be 2062900
(misprint)

Li I

Number of double excited configurations have unorthodox designations:

1s.2,3.sp+ 1s2s3p

1s.2,3.sp- 1s2p3s

1s.2,4.sp+ 1s2s4p

1s.2,4.sp- --> 1s2p4s

Mg I

Level 6d added

1 line added; overlap with 5d

Mg II

Some revisions and
extensions of the Mg II levels as given in the 1991 wavelengths table
are also used in the levels table here. In addition, newly evaluated
positions for the quartet levels of configurations involving the
2p5(2Po) excited core are also given
in the tables here. All these quartet levels are now given with
respect to the 2p63s 2S ground level without
any unknown connection ("+x").